In some cases

This may sacrifice performance outside of the tuned RPM range for maximum efficiency

Arias Forged Pistons (86

Keep your engine responsive

IP67/IP69K Waterproof rating – Guaranteed to be dust tight and sealed against water immersion to a depth of 1 meter for up to 1 hour

BMW S63 Valve Spring Kit by Ferrea VI In some casesThe Ferrea Valve Spring Kit for BMW S63 engines is engineered for superior durability and performance under extreme conditions. This kit replaces BMW part numbers 11340039494, 11340054492, 11347578825, 11347572451, 11347504271, 11347614134, and 11340150843. Factory valve springs can struggle to meet the demands of high boost, aggressive cam profiles, and sustained high RPM, leading to valve float and potential engine failure. Ferrea valve springs are